Quote Originally Posted by Burnt Toast
Synthetic urine should not be used if a full-blown medical test is performed. The synthetic urine would conceal any diseases or other health-related issues that you may not be aware of in which the medical test would bring to your attention.

For the sake of argument - If the 'semi-clean' urine sample contains metabolite levels low enough to register below the cutoff limit of the drug screen, then why not use it as a whole instead of mixing it with synthetic?
And how would you know how low the levels were without paying to have a quantitative analysis (GC/MS) performed? The Immunoassay screen (as well as the home assays) wouldnt tell you diddly-squat. They are a pass/fail endeavor.
Wouldn't it be in my interest to conceal any health issues that may be present since that could impact whether or not I get approved for coverage?

I have had multiple samples tested in the lab before so I have a good idea of what my levels are now and how long I need to wait before I am below the cutoff (21-25 days). If that much time has not passed but it is close, would externally mixing with synthetic work?